mirror of
https://github.com/mackron/miniaudio.git
synced 2026-04-22 00:06:59 +02:00
David Reid
607 lines
29 KiB
HTML
607 lines
29 KiB
HTML
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<head>
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<title>miniaudio - A single file audio playback and capture library.</title>
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<meta name="description" content="miniaudio is a single file audio playback and capture library written in C.">
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<td><a href="../manual/index.html">Documentation</a></td>
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<td><a href="index.html">Examples</a></td>
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<a href="https://www.reddit.com/r/miniaudio"><img src="../../img/reddit_white.svg" style="margin:0; padding:0; height:40px; width:40px;"></a>
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<a rel="me" href="https://fosstodon.org/@mackron"><img src="../../img/mastodon_white.svg" style="margin:0; padding:0; height:24px; width:32px;"></a>
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<a href="https://github.com/mackron/miniaudio"><img src="../../img/github_white.png" style="margin:0; padding:0; height:24px; width:24px;"></a>
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<div style="background-color:#fff; padding-bottom:0em; border-top:solid 1px #003800; background-color:#eee;">
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<table border="0" style="margin:0 auto; width:100%; border-collapse:collapse; border:solid 0px #000; table-layout:fixed;"><tr>
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<td valign="top" style="width:20em; padding:0; margin:0; border-right:solid 0px #000;"><div style="position:relative; height:100%; width:100%; border:solid 0px #000; padding:0; margin:0;">
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<a href="../index.html" class="doc-navigation">Documentation Home</a><a href="../manual/index.html" class="doc-navigation">Programming Manual</a><a href="index.html" class="doc-navigation ">Examples</a><a href="custom_backend.html" class="doc-navigation doc-navigation-l1 ">Custom Backend</a><a href="custom_decoder.html" class="doc-navigation doc-navigation-l1 ">Custom Decoder</a><a href="custom_decoder_engine.html" class="doc-navigation doc-navigation-l1 ">Custom Decoder Engine</a><a href="data_source_chaining.html" class="doc-navigation doc-navigation-l1 ">Data Source Chaining</a><a href="duplex_effect.html" class="doc-navigation doc-navigation-l1 ">Duplex Effect</a><a href="engine_advanced.html" class="doc-navigation doc-navigation-l1 ">Engine Advanced</a><a href="engine_effects.html" class="doc-navigation doc-navigation-l1 ">Engine Effects</a><a href="engine_hello_world.html" class="doc-navigation doc-navigation-l1 ">Engine Hello World</a><a href="engine_sdl.html" class="doc-navigation doc-navigation-l1 ">Engine Sdl</a><a href="engine_steamaudio.html" class="doc-navigation doc-navigation-l1 ">Engine Steamaudio</a><a href="node_graph.html" class="doc-navigation doc-navigation-l1 ">Node Graph</a><a href="resource_manager.html" class="doc-navigation doc-navigation-l1 ">Resource Manager</a><a href="resource_manager_advanced.html" class="doc-navigation doc-navigation-l1 doc-navigation-active">Resource Manager Advanced</a><a href="simple_capture.html" class="doc-navigation doc-navigation-l1 ">Simple Capture</a><a href="simple_duplex.html" class="doc-navigation doc-navigation-l1 ">Simple Duplex</a><a href="simple_enumeration.html" class="doc-navigation doc-navigation-l1 ">Simple Enumeration</a><a href="simple_loopback.html" class="doc-navigation doc-navigation-l1 ">Simple Loopback</a><a href="simple_looping.html" class="doc-navigation doc-navigation-l1 ">Simple Looping</a><a href="simple_mixing.html" class="doc-navigation doc-navigation-l1 ">Simple Mixing</a><a href="simple_playback.html" class="doc-navigation doc-navigation-l1 ">Simple Playback</a><a href="simple_playback_sine.html" class="doc-navigation doc-navigation-l1 ">Simple Playback Sine</a><a href="simple_playback_sine.html" class="doc-navigation doc-navigation-l1 ">Simple Playback Sine</a><a href="../api/index.html" class="doc-navigation" style="border-bottom:none;">API Reference</a></div></td><td valign="top" style="padding:1em; border-left:solid 1px #bbb;">
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<h1>Resource Manager Advanced</h1><p>
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Demonstrates how you can use the resource manager to manage loaded sounds.
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</p>
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<p>
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The resource manager can be used to create a data source whose resources are managed internally by miniaudio. The data
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sources can then be read just like any other data source such as decoders and audio buffers.
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</p>
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<p>
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In this example we use the resource manager independently of the <span style="font-family:monospace;">ma_engine</span> API so that we can demonstrate how it can
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be used by itself without getting it confused with <span style="font-family:monospace;">ma_engine</span>.
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</p>
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<p>
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The main feature of the resource manager is the ability to decode and stream audio data asynchronously. Asynchronicity
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is achieved with a job system. The resource manager will issue jobs which are processed by a configurable number of job
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threads. You can also implement your own custom job threads which this example also demonstrates.
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</p>
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<p>
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In this example we show how you can create a data source, mix them with other data sources, configure the number of job
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threads to manage internally and how to implement your own custom job thread.</p>
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<div style="font-family:monospace; border:solid 1px #003800; border-left:solid 0.5em #003800; margin:1em 0em; width:100%;"><pre style="margin:0.5em 1em; padding:0; line-height:125%; overflow-x:auto;">
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<span style="color:#666666">#define</span> MA_NO_ENGINE <span style="color:#009900">/* We're intentionally not using the ma_engine API here. */</span>
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<span style="color:#666666">#define</span> MINIAUDIO_IMPLEMENTATION
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<span style="color:#666666">#include</span> <span style="color:#cc3300">"../miniaudio.h"</span>
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<span style="color:#0033ff">static</span> ma_resource_manager_data_source g_dataSources[16];
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<span style="color:#0033ff">static</span> <span style="color:#0099cc">ma_uint32</span> g_dataSourceCount;
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<span style="color:#009900">/*
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TODO: Consider putting these public functions in miniaudio.h. Will depend on ma_mix_pcm_frames_f32()
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being merged into miniaudio.h (it's currently in miniaudio_engine.h).
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*/</span>
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<span style="color:#0033ff">static</span> <span style="color:#0099cc">ma_result</span> ma_data_source_read_pcm_frames_f32_ex(<span style="color:#0099cc">ma_data_source</span>* pDataSource, <span style="color:#0033ff">float</span>* pFramesOut, <span style="color:#0099cc">ma_uint64</span> frameCount, <span style="color:#0099cc">ma_uint64</span>* pFramesRead, ma_format dataSourceFormat, <span style="color:#0099cc">ma_uint32</span> dataSourceChannels)
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{
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<span style="color:#009900">/*
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This function is intended to be used when the format and channel count of the data source is
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known beforehand. The idea is to avoid overhead due to redundant calls to ma_data_source_get_data_format().
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*/</span>
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MA_ASSERT(pDataSource != NULL);
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<span style="color:#0033ff">if</span> (dataSourceFormat == ma_format_f32) {
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<span style="color:#009900">/* Fast path. No conversion necessary. */</span>
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<span style="color:#0033ff">return</span> ma_data_source_read_pcm_frames(pDataSource, pFramesOut, frameCount, pFramesRead);
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} <span style="color:#0033ff">else</span> {
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<span style="color:#009900">/* Slow path. Conversion necessary. */</span>
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<span style="color:#0099cc">ma_result</span> result;
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<span style="color:#0099cc">ma_uint64</span> totalFramesRead;
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<span style="color:#0099cc">ma_uint8</span> temp[MA_DATA_CONVERTER_STACK_BUFFER_SIZE];
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<span style="color:#0099cc">ma_uint64</span> tempCapInFrames = <span style="color:#0033ff">sizeof</span>(temp) / ma_get_bytes_per_frame(dataSourceFormat, dataSourceChannels);
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totalFramesRead = 0;
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<span style="color:#0033ff">while</span> (totalFramesRead < frameCount) {
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<span style="color:#0099cc">ma_uint64</span> framesJustRead;
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<span style="color:#0099cc">ma_uint64</span> framesToRead = frameCount - totalFramesRead;
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<span style="color:#0033ff">if</span> (framesToRead > tempCapInFrames) {
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framesToRead = tempCapInFrames;
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}
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result = ma_data_source_read_pcm_frames(pDataSource, pFramesOut, framesToRead, &framesJustRead);
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ma_convert_pcm_frames_format(ma_offset_pcm_frames_ptr_f32(pFramesOut, totalFramesRead, dataSourceChannels), ma_format_f32, temp, dataSourceFormat, framesJustRead, dataSourceChannels, ma_dither_mode_none);
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totalFramesRead += framesJustRead;
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<span style="color:#0033ff">if</span> (result != MA_SUCCESS) {
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<span style="color:#0033ff">break</span>;
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}
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}
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<span style="color:#0033ff">return</span> MA_SUCCESS;
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}
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}
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MA_API <span style="color:#0099cc">ma_result</span> ma_data_source_read_pcm_frames_f32(<span style="color:#0099cc">ma_data_source</span>* pDataSource, <span style="color:#0033ff">float</span>* pFramesOut, <span style="color:#0099cc">ma_uint64</span> frameCount, <span style="color:#0099cc">ma_uint64</span>* pFramesRead)
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{
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<span style="color:#0099cc">ma_result</span> result;
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ma_format format;
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<span style="color:#0099cc">ma_uint32</span> channels;
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result = ma_data_source_get_data_format(pDataSource, &format, &channels, NULL, NULL, 0);
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<span style="color:#0033ff">if</span> (result != MA_SUCCESS) {
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<span style="color:#0033ff">return</span> result; <span style="color:#009900">/* Failed to retrieve the data format of the data source. */</span>
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}
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<span style="color:#0033ff">return</span> ma_data_source_read_pcm_frames_f32_ex(pDataSource, pFramesOut, frameCount, pFramesRead, format, channels);
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}
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MA_API <span style="color:#0099cc">ma_result</span> ma_data_source_read_pcm_frames_and_mix_f32(<span style="color:#0099cc">ma_data_source</span>* pDataSource, <span style="color:#0033ff">float</span>* pFramesOut, <span style="color:#0099cc">ma_uint64</span> frameCount, <span style="color:#0099cc">ma_uint64</span>* pFramesRead, <span style="color:#0033ff">float</span> volume)
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{
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<span style="color:#0099cc">ma_result</span> result;
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ma_format format;
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<span style="color:#0099cc">ma_uint32</span> channels;
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<span style="color:#0099cc">ma_uint64</span> totalFramesRead;
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<span style="color:#0033ff">if</span> (pFramesRead != NULL) {
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*pFramesRead = 0;
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}
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<span style="color:#0033ff">if</span> (pDataSource == NULL) {
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<span style="color:#0033ff">return</span> MA_INVALID_ARGS;
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}
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result = ma_data_source_get_data_format(pDataSource, &format, &channels, NULL, NULL, 0);
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<span style="color:#0033ff">if</span> (result != MA_SUCCESS) {
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<span style="color:#0033ff">return</span> result; <span style="color:#009900">/* Failed to retrieve the data format of the data source. */</span>
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}
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totalFramesRead = 0;
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<span style="color:#0033ff">while</span> (totalFramesRead < frameCount) {
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<span style="color:#0033ff">float</span> temp[MA_DATA_CONVERTER_STACK_BUFFER_SIZE/<span style="color:#0033ff">sizeof</span>(<span style="color:#0033ff">float</span>)];
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<span style="color:#0099cc">ma_uint64</span> tempCapInFrames = ma_countof(temp) / channels;
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<span style="color:#0099cc">ma_uint64</span> framesJustRead;
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<span style="color:#0099cc">ma_uint64</span> framesToRead = frameCount - totalFramesRead;
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<span style="color:#0033ff">if</span> (framesToRead > tempCapInFrames) {
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framesToRead = tempCapInFrames;
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}
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result = ma_data_source_read_pcm_frames_f32_ex(pDataSource, temp, framesToRead, &framesJustRead, format, channels);
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ma_mix_pcm_frames_f32(ma_offset_pcm_frames_ptr(pFramesOut, totalFramesRead, ma_format_f32, channels), temp, framesJustRead, channels, volume);
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totalFramesRead += framesJustRead;
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<span style="color:#0033ff">if</span> (result != MA_SUCCESS) {
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<span style="color:#0033ff">break</span>;
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}
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}
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<span style="color:#0033ff">if</span> (pFramesRead != NULL) {
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*pFramesRead = totalFramesRead;
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}
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<span style="color:#0033ff">return</span> MA_SUCCESS;
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}
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<span style="color:#0033ff">void</span> data_callback(<span style="color:#0099cc">ma_device</span>* pDevice, <span style="color:#0033ff">void</span>* pOutput, <span style="color:#0033ff">const</span> <span style="color:#0033ff">void</span>* pInput, <span style="color:#0099cc">ma_uint32</span> frameCount)
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{
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<span style="color:#009900">/*
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In this example we're just going to play our data sources layered on top of each other. This
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assumes the device's format is f32 and that the buffer is not pre-silenced.
|
|
*/</span>
|
|
<span style="color:#0099cc">ma_uint32</span> iDataSource;
|
|
|
|
MA_ASSERT(pDevice->playback.format == ma_format_f32);
|
|
|
|
(<span style="color:#0033ff">void</span>)pInput; <span style="color:#009900">/* Unused. */</span>
|
|
|
|
<span style="color:#009900">/*
|
|
If the device was configured with noPreSilencedOutputBuffer then you would need to silence the
|
|
buffer here, or make sure the first data source to be mixed is copied rather than mixed.
|
|
*/</span>
|
|
<span style="color:#009900">/*ma_silence_pcm_frames(pOutput, frameCount, ma_format_f32, pDevice->playback.channels);*/</span>
|
|
|
|
<span style="color:#009900">/* For each sound, mix as much data as we can. */</span>
|
|
<span style="color:#0033ff">for</span> (iDataSource = 0; iDataSource < g_dataSourceCount; iDataSource += 1) {
|
|
ma_data_source_read_pcm_frames_and_mix_f32(&g_dataSources[iDataSource], (<span style="color:#0033ff">float</span>*)pOutput, frameCount, NULL, <span style="color:#009900">/* volume = */</span>1);
|
|
}
|
|
}
|
|
|
|
<span style="color:#0033ff">static</span> ma_thread_result MA_THREADCALL custom_job_thread(<span style="color:#0033ff">void</span>* pUserData)
|
|
{
|
|
ma_resource_manager* pResourceManager = (ma_resource_manager*)pUserData;
|
|
MA_ASSERT(pResourceManager != NULL);
|
|
|
|
<span style="color:#0033ff">for</span> (;;) {
|
|
<span style="color:#0099cc">ma_result</span> result;
|
|
ma_resource_manager_job job;
|
|
|
|
<span style="color:#009900">/*
|
|
Retrieve a job from the queue first. This defines what it is you're about to do. By default this will be
|
|
blocking. You can initialize the resource manager with MA_RESOURCE_MANAGER_FLAG_NON_BLOCKING to not block in
|
|
which case MA_NO_DATA_AVAILABLE will be returned if no jobs are available.
|
|
|
|
When the quit job is returned (MA_RESOURCE_MANAGER_JOB_QUIT), the return value will always be MA_CANCELLED. If you don't want
|
|
to check the return value (you should), you can instead check if the job code is MA_RESOURCE_MANAGER_JOB_QUIT and use that
|
|
instead.
|
|
*/</span>
|
|
result = ma_resource_manager_next_job(pResourceManager, &job);
|
|
<span style="color:#0033ff">if</span> (result != MA_SUCCESS) {
|
|
<span style="color:#0033ff">if</span> (result == MA_CANCELLED) {
|
|
printf(<span style="color:#cc3300">"CUSTOM JOB THREAD TERMINATING VIA MA_CANCELLED... "</span>);
|
|
} <span style="color:#0033ff">else</span> {
|
|
printf(<span style="color:#cc3300">"CUSTOM JOB THREAD ERROR: %s. TERMINATING... "</span>, ma_result_description(result));
|
|
}
|
|
|
|
<span style="color:#0033ff">break</span>;
|
|
}
|
|
|
|
<span style="color:#009900">/*
|
|
Terminate if we got a quit message. You don't need to terminate like this, but's a bit more robust. You can
|
|
just use a global variable or something similar if it's easier for your particular situation. The quit job
|
|
remains in the queue and will continue to be returned by future calls to ma_resource_manager_next_job(). The
|
|
reason for this is to give every job thread visibility to the quit job so they have a chance to exit.
|
|
|
|
We won't actually be hitting this code because the call above will return MA_CANCELLED when the MA_RESOURCE_MANAGER_JOB_QUIT
|
|
event is received which means the <span style="font-family:monospace;">result != MA_SUCCESS</span> logic above will catch it. If you do not check the
|
|
return value of ma_resource_manager_next_job() you will want to check for MA_RESOURCE_MANAGER_JOB_QUIT like the code below.
|
|
*/</span>
|
|
<span style="color:#0033ff">if</span> (job.toc.breakup.code == MA_RESOURCE_MANAGER_JOB_QUIT) {
|
|
printf(<span style="color:#cc3300">"CUSTOM JOB THREAD TERMINATING VIA MA_RESOURCE_MANAGER_JOB_QUIT... "</span>);
|
|
<span style="color:#0033ff">break</span>;
|
|
}
|
|
|
|
<span style="color:#009900">/* Call ma_resource_manager_process_job() to actually do the work to process the job. */</span>
|
|
printf(<span style="color:#cc3300">"PROCESSING IN CUSTOM JOB THREAD: %d\n"</span>, job.toc.breakup.code);
|
|
ma_resource_manager_process_job(pResourceManager, &job);
|
|
}
|
|
|
|
printf(<span style="color:#cc3300">"TERMINATED\n"</span>);
|
|
<span style="color:#0033ff">return</span> (ma_thread_result)0;
|
|
}
|
|
|
|
<span style="color:#0033ff">int</span> main(<span style="color:#0033ff">int</span> argc, <span style="color:#0033ff">char</span>** argv)
|
|
{
|
|
<span style="color:#0099cc">ma_result</span> result;
|
|
<span style="color:#0099cc">ma_device_config</span> deviceConfig;
|
|
<span style="color:#0099cc">ma_device</span> device;
|
|
ma_resource_manager_config resourceManagerConfig;
|
|
ma_resource_manager resourceManager;
|
|
<span style="color:#0099cc">ma_thread</span> jobThread;
|
|
<span style="color:#0033ff">int</span> iFile;
|
|
|
|
deviceConfig = ma_device_config_init(ma_device_type_playback);
|
|
deviceConfig.playback.format = ma_format_f32;
|
|
deviceConfig.dataCallback = data_callback;
|
|
deviceConfig.pUserData = NULL;
|
|
|
|
result = ma_device_init(NULL, &deviceConfig, &device);
|
|
<span style="color:#0033ff">if</span> (result != MA_SUCCESS) {
|
|
printf(<span style="color:#cc3300">"Failed to initialize device."</span>);
|
|
<span style="color:#0033ff">return</span> -1;
|
|
}
|
|
|
|
|
|
<span style="color:#009900">/* We can start the device before loading any sounds. We'll just end up outputting silence. */</span>
|
|
result = ma_device_start(&device);
|
|
<span style="color:#0033ff">if</span> (result != MA_SUCCESS) {
|
|
ma_device_uninit(&device);
|
|
printf(<span style="color:#cc3300">"Failed to start device."</span>);
|
|
<span style="color:#0033ff">return</span> -1;
|
|
}
|
|
|
|
|
|
<span style="color:#009900">/*
|
|
We have the device so now we want to initialize the resource manager. We'll use the resource manager to load some
|
|
sounds based on the command line.
|
|
*/</span>
|
|
resourceManagerConfig = ma_resource_manager_config_init();
|
|
|
|
<span style="color:#009900">/*
|
|
We'll set a standard decoding format to save us to processing time at mixing time. If you're wanting to use
|
|
spatialization with your decoded sounds, you may want to consider leaving this as 0 to ensure the file's native
|
|
channel count is used so you can do proper spatialization.
|
|
*/</span>
|
|
resourceManagerConfig.decodedFormat = device.playback.format;
|
|
resourceManagerConfig.decodedChannels = device.playback.channels;
|
|
resourceManagerConfig.decodedSampleRate = device.sampleRate;
|
|
|
|
<span style="color:#009900">/* The number of job threads to be managed internally. Set this to 0 if you want to self-manage your job threads */</span>
|
|
resourceManagerConfig.jobThreadCount = 4;
|
|
|
|
result = ma_resource_manager_init(&resourceManagerConfig, &resourceManager);
|
|
<span style="color:#0033ff">if</span> (result != MA_SUCCESS) {
|
|
ma_device_uninit(&device);
|
|
printf(<span style="color:#cc3300">"Failed to initialize the resource manager."</span>);
|
|
<span style="color:#0033ff">return</span> -1;
|
|
}
|
|
|
|
<span style="color:#009900">/*
|
|
Now that we have a resource manager we can set up our custom job thread. This is optional. Normally when doing
|
|
self-managed job threads you would set the internal job thread count to zero. We're doing both internal and
|
|
self-managed job threads in this example just for demonstration purposes.
|
|
*/</span>
|
|
ma_thread_create(&jobThread, ma_thread_priority_default, 0, custom_job_thread, &resourceManager, NULL);
|
|
|
|
<span style="color:#009900">/* Create each data source from the resource manager. Note that the caller is the owner. */</span>
|
|
<span style="color:#0033ff">for</span> (iFile = 0; iFile < ma_countof(g_dataSources) && iFile < argc-1; iFile += 1) {
|
|
result = ma_resource_manager_data_source_init(
|
|
&resourceManager,
|
|
argv[iFile+1],
|
|
MA_RESOURCE_MANAGER_DATA_SOURCE_FLAG_DECODE | MA_RESOURCE_MANAGER_DATA_SOURCE_FLAG_ASYNC <span style="color:#009900">/*| MA_RESOURCE_MANAGER_DATA_SOURCE_FLAG_STREAM*/</span>,
|
|
NULL, <span style="color:#009900">/* Async notification. */</span>
|
|
&g_dataSources[iFile]);
|
|
|
|
<span style="color:#0033ff">if</span> (result != MA_SUCCESS) {
|
|
<span style="color:#0033ff">break</span>;
|
|
}
|
|
|
|
<span style="color:#009900">/* Use looping in this example. */</span>
|
|
ma_data_source_set_looping(&g_dataSources[iFile], MA_TRUE);
|
|
|
|
g_dataSourceCount += 1;
|
|
}
|
|
|
|
printf(<span style="color:#cc3300">"Press Enter to quit..."</span>);
|
|
getchar();
|
|
|
|
|
|
<span style="color:#009900">/* Teardown. */</span>
|
|
|
|
<span style="color:#009900">/*
|
|
Uninitialize the device first to ensure the data callback is stopped and doesn't try to access
|
|
any data.
|
|
*/</span>
|
|
ma_device_uninit(&device);
|
|
|
|
<span style="color:#009900">/*
|
|
Our data sources need to be explicitly uninitialized. ma_resource_manager_uninit() will not do
|
|
it for us. This needs to be done before posting the quit event and uninitializing the resource
|
|
manager or else we'll get stuck in a deadlock because ma_resource_manager_data_source_uninit()
|
|
will be waiting for the job thread(s) to finish work, which will never happen because they were
|
|
just terminated.
|
|
*/</span>
|
|
<span style="color:#0033ff">for</span> (iFile = 0; (size_t)iFile < g_dataSourceCount; iFile += 1) {
|
|
ma_resource_manager_data_source_uninit(&g_dataSources[iFile]);
|
|
}
|
|
|
|
<span style="color:#009900">/*
|
|
Before uninitializing the resource manager we need to make sure a quit event has been posted to
|
|
ensure we can get out of our custom thread. The call to ma_resource_manager_uninit() will also
|
|
do this, but we need to call it explicitly so that our self-managed thread can exit naturally.
|
|
You only need to post a quit job if you're using that as the exit indicator. You can instead
|
|
use whatever variable you want to terminate your job thread, but since this example is using a
|
|
quit job we need to post one. Note that you don't need to do this if you're not managing your
|
|
own threads - ma_resource_manager_uninit() alone will suffice in that case.
|
|
*/</span>
|
|
ma_resource_manager_post_job_quit(&resourceManager);
|
|
ma_thread_wait(&jobThread); <span style="color:#009900">/* Wait for the custom job thread to finish so it doesn't try to access any data. */</span>
|
|
|
|
<span style="color:#009900">/* Uninitialize the resource manager after each data source. */</span>
|
|
ma_resource_manager_uninit(&resourceManager);
|
|
|
|
<span style="color:#0033ff">return</span> 0;
|
|
}
|
|
</pre></div></td>
|
|
</tr></table>
|
|
</div>
|
|
<table style="margin:0 auto; padding:1em 0px; text-align:center;">
|
|
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|
|
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|
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</tr>
|
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</table>
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<div style="color:#e0d7cf; font-size:9pt; padding:2em 0px; text-align:center;">
|
|
Copyright © 2023 David Reid<br/>
|
|
Developed by David Reid - <a class="footer-link" href="mailto:mackron@gmail.com">mackron@gmail.com</a>
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